Dihalo-compound and process for producing vitamin A derivative
US6388124B2 · kind B2 · utility
1Cited by
5References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is disclosed a dihalo-compound of formula (1): whereinX1 and X2 represent different halogen atoms,R represents a hydrogen atom or a protective group for a hydroxyl group, and a process for producing vitamin A derivative via a sulfone derivative of formula (5): wherein Ar represents an optionally substituted aryl group, and R represents the same as defined above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.